i'm just a beginner, so excuse the stupid questions please... but what advantage comes from loosing connection with your partner (whether you are uke or nage) except for when you need to roll away to save yourself, and even then it is just the physical contact that you give up...but at the last moment. if you're not connected, you can't feel the other person or their intent, can you?
and i thought that ukes should only attack as fast and hard as they are able to fall, since some techniques can't do much to disipate that energy before it comes back to uke... isn't it wiser to tell the kohai to ease up the attack than demonstrate energy in = energy out if their ukemi is not up to it?